Topic Category

GA Catalogue Number

Keywords

Resource Language

English

Resource Character Set

utf8

Resource Security Classification

unclassified

Geographic Extent

North bound

-35.0

East bound

150.78

West bound

150.67725

South bound

-35.13

Lineage

Bottom sediments were collected using a small 'Shipek' type grab sampler.This device can collect an intact sample of sediment
up to 5 cm by 12 cm in area and 5 cm thick. Upon triggering, the grab immediately covers the sample, which prevents wash-out
of fine sediment during retrieval to the surface. The surface sediments (~0-2 cm) within the grab were spooned into falcon
vials and the porewaters were removed by centrifugation (9000 rpm; 5 minutes). The samples were then frozen for transport
to the laboratories at Geoscience Australia where they were freeze-dried and ground in a PSZ mill, after first removing a
sub-sample (unground) for surface area analysis. Major and trace elements were determined by X-ray fluorescence at Geoscience
Australia using a Phillips PW204 4kW sequential spectrometer. Surface areas were determined using a 5-point Brunauer-Emmett-Teller
(BET) adsorption isotherm on a Quantachrome NOVA 2200e analyser, with nitrogen used as the adsorbate. The samples were first
cleaned of organic matter by slow heating for 12 hours to 350oC. Data quality is moderate (+/- 10%). A C-NAV system was used
to provide geographical position with a manufacturer accuracy of 10 cm RMS.
Acknowledgments:
Geoscience Australia unertook a series of field campaigns in Jervis Bay (Dec 2007 to present) as part of the Surrogates Program
in the Commonwealth (Australia) Environmental Research Facilities (CERF) Marine Biodiversity Hub. Thanks are owning to a range
of people for there generous contributions to this study. Scott Corson (the master of the M.V. Kimbla), Matthew Carey, Peter
Harris, Mike Hughes, Jodie Smith and Anna Potter provided field support. Billie Poignand and Kylia Wall dried and ground these
samples, while Tony Watson undertook the surface area analysis and Liz Webber undertook the XRF analysis. This dataset is
also available online via the OzCoasts (www.ozcoasts.org.au) and MARS (http://www.ga.gov.au/oracle/mars/) databases.